Film-pack.



R. SOHUTTAUF.

Patented Jan. 23, 1912.

in.-'- him packs.

UNITED STATES PATENT mica RICHARD SCH'U'TTAUF, 0F JENA,'GEBMANY, ASS IGNOR TO THE FIRM 01E CARL ZEISS,

0F JE-NA, GERMANY. v

FILM-PACK.

Specification of Letters Patent.

Patented Jan. 23, 11912.

Application filed March 31, 1910. Serial No. 552,691.

To all whom it may concern:

Be it known that I, RICHARD Sorrii'rrAUF, a citizen of the- German Empire, residing at Carl-Zeiss strasse, Jena, in the Grand Duchy of Saxe-Weimzii, Germany, have invented a new and useful Film-Pack, of which the following is a specification.

The invention consists in an improvement It is a well known disadvantage of these packs, that in the operation of changing, '2 a, in removing after exposure that one of the film sheets. (fixed on carriers impermeable tolight) which for.

the timerbeing is the front sheet, or in the shifting of a shutter or covering sheet de- S1g118l ',t0 obviate an, untimely exposure,

often the sensitive la or at least at its stir-- face, is damaged.

According to the present invention, the film sheet is to be arranged on its carrier in such a way that its sensitive layer faces thecarrier. Then, of course, the position of the negative image on the film sheet differs from the usual posit-ion, sothat in the printing work the transparent backing, which together with the sensitive layer forms the film sheet, separates as an intermediate layerthe negative image from the positive image to be produced. But that does not afford any perceptible disadvantage, as long as. the backing'is not essentia-lly thicker than those hitherto used.- "For time exposures a second advantage may be derived from the reversed position of the film sheets by coloring the transparent backing of the sensitive layer deepyellojw, so as to save employing a yellow screen disk in front of the objective. Such v disks, as is well. known,'must be made with 7 great care, as otherwise a deterioration of the image takes place, their cost being correspondingly high.

In the annexed drawing a section through a film pack constructed according to the in vention is represented.

To each carrier (0 a film sheet 5 0 is fixed in such a position that the sensitive layer 6 immediately faces the carrier. The backing 0 of the film sheet serves as a covering, which prevents the layer 6 from being damaged, when the film sheet, having become after exposure is being pulled along" the inner surface cZ of the casing 03 in the next operation of changing. In the example shown, the operating extension 6 of each carrier has the same thickness as both the carrier proper a and the'sheet b 0 together.

rear chamber is an immovable part of the casing (Z, a special loose plate f and a prescally shifting, during each operation of RICHARD sonUTTAun'. Witnesses: I I I .PAUL Km'iona, A FRED -M AGKEDANZ.

With regard thereto the front wall at of the sure spring 9 beingprovided for antomatiw changing, the contents of the front chamber the foremost by the operation of changing, r 

